This implicitly fixes x86-32 builds that fail at runtime, because late barrier expansion is not implemented for them. I think about this check as something that we should have done as part of original JDK-8334060.
The first version was summarily disabling G1 on platforms not explicitly listed in arches. Unfortunately, that affects Zero, while the problem we are working out is G1+C2 support. The second revision of this PR checks for `compiler2` and x86-32 explicitly, and disables G1 only then. Additional testing: - [x] Linux x86_32 server fastdebug, `make bootcycle-images` now passes - [x] A matrix of (server, zero) builds on different platforms ------------- Commit messages: - More precise check: only for G1+C2 - Fix Changes: https://git.openjdk.org/jdk/pull/21493/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21493&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8341871 Stats: 19 lines in 1 file changed: 19 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/21493.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/21493/head:pull/21493 PR: https://git.openjdk.org/jdk/pull/21493
